#include <etcd/Client.hpp>
#include <etcd/KeepAlive.hpp>
#include <etcd/Response.hpp>
#include <etcd/Watcher.hpp>
#include <etcd/Value.hpp>
#include <thread>
#include "../common/logger.hpp"
// 服务注册接口
class Registry
{
public:
    Registry(const std::string &host) : _client(std::make_shared<etcd::Client>(host)),
                                        _keep_alive(_client->leasekeepalive(3).get()),
                                        _lease_id(_keep_alive->Lease())
    {
    }
    ~Registry()
    {
        _keep_alive->Cancel();
    }
    bool registry(const std::string &key, const std::string &val)
    {

        auto resp = _client->put("/service/user", "127.0.0.1:8080", _lease_id).get(); // 这个是指针
        if (resp.is_ok() == false)
        {
            std::cout << "新增数据失败" << resp.error_message() << std::endl;
            LOG_ERROR("注册数据失败:{}", resp.error_message());
            return -1;
        }
    }

private:
    std::shared_ptr<etcd::Client> _client;
    std::shared_ptr<etcd::KeepAlive> _keep_alive;
    uint64_t _lease_id;
};
// 服务发现类
class Discovery
{
public:
    using NotifyCallback = std::function<void(std::string, std::string)>;
    Discovery(const std::string &host, const std::string &basedir, const NotifyCallback &put_cb, const NotifyCallback &del_cb) : _client(std::make_shared<etcd::Client>(host)),

                                                                                                                                 _put_cb(put_cb),
                                                                                                                                 _del_cb(del_cb)

    {

        auto resp = _client->ls(basedir).get();
        if (resp.is_ok() == false)
        {
            LOG_ERROR("获取服务数据失败:{}", resp.error_message());
        }
        int sz = resp.keys().size();
        for (int i = 0; i < sz; i++)
        {
            std::cout << resp.value(i).as_string() << "可以提供" << resp.key(i) << std::endl;
            if (put_cb)
                _put_cb(resp.key(i), resp.value(i).as_string());
        }
        _watcher = std::make_shared<etcd::Watcher>(*_client.get(), basedir, std::bind(&Discovery::callback, this, std::placeholders::_1), true);
    }

private:
    void callback(const etcd::Response &resp)
    {
        if (resp.is_ok() == false)
        {

            LOG_ERROR("收到一个错误的事件通知:{}", resp.error_message());
            return;
        }
        for (auto const &ev : resp.events())
        {
            if (ev.event_type() == etcd::Event::EventType::PUT)
            {

                if (_put_cb)
                    _put_cb(ev.kv().key(), ev.kv().as_string());
                LOG_DEBUG("新增服务 {}-{}", ev.kv().key(), ev.kv().as_string());
            }
            else if (ev.event_type() == etcd::Event::EventType::DELETE_)
            {
                if (_del_cb)
                    _del_cb(ev.prev_kv().key(), ev.prev_kv().as_string());
                LOG_DEBUG("下线服务 {}-{}", ev.prev_kv().key(), ev.prev_kv().as_string());
            }
        }
    }
    private:

        NotifyCallback _put_cb;
        NotifyCallback _del_cb;
        std::shared_ptr<etcd::Client> _client;
        std::shared_ptr<etcd::Watcher> _watcher;
    };